I understand the small tent woes. Mine is 32"x32"x63" but I still manage to cram up to 4 plants in it and 4 old style Mars Hydro 300 watt LED's in it (140 actual draw each). Height can become the biggest problem so I usually top and LST them to keep em as short as possible. I've still had strains that want to go strait up and in that case I have to change out my regular light hangers for some zip ties to gain about 6 more inches of headroom. With the LEDs I normally run them 12" from plant tops in bloom but I've had them as close as 8" when I couldn't raise them any further and they still didn't burn the plant. No way I could run a HPS bulb in there. Well maybe, but I'd have to scrog it out.